| /* |
| * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 8003833 |
| * @summary Spurious NPE from Socket.getIn/OutputStream |
| */ |
| |
| import java.io.IOException; |
| import java.lang.reflect.Constructor; |
| import java.net.ServerSocket; |
| import java.net.Socket; |
| import java.util.concurrent.Phaser; |
| |
| // Racey test, will not always fail, but if it does then there is a problem. |
| |
| public class Streams { |
| static final int NUM_THREADS = 100; |
| static volatile boolean failed; |
| static final Phaser startingGate = new Phaser(NUM_THREADS + 1); |
| |
| public static void main(String[] args) throws Exception { |
| |
| try (ServerSocket ss = new ServerSocket(0)) { |
| runTest(OutputStreamGetter.class, ss); |
| runTest(InputStreamGetter.class, ss); |
| } |
| |
| if (failed) |
| throw new RuntimeException("Failed, check output"); |
| } |
| |
| static void runTest(Class<? extends StreamGetter> klass, ServerSocket ss) |
| throws Exception |
| { |
| final int port = ss.getLocalPort(); |
| Socket[] sockets = new Socket[NUM_THREADS]; |
| for (int i=0; i<NUM_THREADS; i++) { |
| sockets[i] = new Socket("localhost", port); |
| try (Socket socket = ss.accept()) {} |
| } |
| |
| Constructor<? extends StreamGetter> ctr = klass.getConstructor(Socket.class); |
| |
| Thread[] threads = new Thread[NUM_THREADS]; |
| for (int i=0; i<NUM_THREADS; i++) |
| threads[i] = ctr.newInstance(sockets[i]); |
| for (int i=0; i<NUM_THREADS; i++) |
| threads[i].start(); |
| |
| startingGate.arriveAndAwaitAdvance(); |
| for (int i=0; i<NUM_THREADS; i++) |
| sockets[i].close(); |
| |
| for (int i=0; i<NUM_THREADS; i++) |
| threads[i].join(); |
| } |
| |
| static abstract class StreamGetter extends Thread { |
| final Socket socket; |
| StreamGetter(Socket s) { socket = s; } |
| |
| @Override |
| public void run() { |
| try { |
| startingGate.arriveAndAwaitAdvance(); |
| getStream(); |
| } catch (IOException x) { |
| // OK, socket may be closed |
| } catch (NullPointerException x) { |
| x.printStackTrace(); |
| failed = true; |
| } |
| } |
| |
| abstract void getStream() throws IOException; |
| } |
| |
| static class InputStreamGetter extends StreamGetter { |
| public InputStreamGetter(Socket s) { super(s); } |
| void getStream() throws IOException { |
| socket.getInputStream(); |
| } |
| } |
| |
| static class OutputStreamGetter extends StreamGetter { |
| public OutputStreamGetter(Socket s) { super(s); } |
| void getStream() throws IOException { |
| socket.getOutputStream(); |
| } |
| } |
| } |